pci: fix info pci with host bridge.

This patch fixes 525e0514.
pci host bridge doesn't have header type of bridge.
The check should be by header type, instead of pci class device.

Cc: Blue Swirl <blauwirbel@gmail.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>

hw/pci.c

@@ -1273,7 +1273,7 @@ static QObject *pci_get_devices_list(PCIBus *bus, int bus_num);
 
 static QObject *pci_get_dev_dict(PCIDevice *dev, PCIBus *bus, int bus_num)
 {
-    int class;
+    uint8_t type;
     QObject *obj;
 
     obj = qobject_from_jsonf("{ 'bus': %d, 'slot': %d, 'function': %d,"                                       "'class_info': %p, 'id': %p, 'regions': %p,"
@@ -1289,8 +1289,8 @@ static QObject *pci_get_dev_dict(PCIDevice *dev, PCIBus *bus, int bus_num)
         qdict_put(qdict, "irq", qint_from_int(dev->config[PCI_INTERRUPT_LINE]));
     }
 
-    class = pci_get_word(dev->config + PCI_CLASS_DEVICE);
-    if (class == PCI_CLASS_BRIDGE_HOST || class == PCI_CLASS_BRIDGE_PCI) {
+    type = dev->config[PCI_HEADER_TYPE] & ~PCI_HEADER_TYPE_MULTI_FUNCTION;
+    if (type == PCI_HEADER_TYPE_BRIDGE) {
         QDict *qdict;
         QObject *pci_bridge;